So at least one thing from series 8 has been resolved. Kryten stated that the crew had grown stronger against the squid's ink, because they encountered the despair squid before. Including Rimmer. And that was in series 6. So obviously, the resurrected Rimmer died aboard the burning Red Dwarf, and the original Rimmer was a 'bit crap' as Ace Rimmer, hence his return. Either way, I was HUGELY impressed with part 3, and it's really wrapped the whole thing up nicely. I loved it.